Subchannel Analysis of SCWR CSR1000 Assembly

Subchannel analysis models have been investigated for SCWR fuel assembly by using experimental data available and Computational Fluid Dynamics（CFD） code in the present paper,which applicability in SCWR analysis is also analyzed,and the analysis results is used to improve the ATHAS code.The steady state subchannel analysis is conducted on the CSR1000 fuel assembly using the improve ATHAS,to obtain the temperature distribution of coolant and cladding and pressure drop in assembly.The result shows that,smaller pitch will flatten the profile of coolant temperature and reduce MCST,but it also increases the pressure drop in the assembly.